Fixed off time and zero voltage switching dual mode power factor correcting converter
    1.
    发明授权
    Fixed off time and zero voltage switching dual mode power factor correcting converter 失效
    固定关断时间和零电压开关双模功率因数校正转换器

    公开(公告)号:US06172492B2

    公开(公告)日:2001-01-09

    申请号:US09515879

    申请日:2000-02-29

    IPC分类号: G05F144

    摘要: A dual mode converter is provided that may be operated as a variable-frequency, naturally-commutated controller in a Zero-Voltage-Switching mode and as a fixed-off-time controller in a Fixed-Off-Time mode. The converter includes four functional elements. A reference and biases element generates voltage references and biases utilized to determine various signal states. A Timing element generates a fixed off time signal and a voltage ramp signal utilized to create the dual modes of operation. A Catastrophic-Event element detects events that cause the converter output be inhibited and the controller to be restarted. A Mode Detection and Pulse Width Modulation element determines the mode of operation for the converter based on signal inputs from the other functional elements and modulates the output accordingly. In a primary mode, the controller utilizes variable frequency operation to deliver primary power. In a standby mode, the controller utilizes fixed frequency operation to provide low power (less than 5W).

    摘要翻译: 提供了双模式转换器,其可以在零电压切换模式中作为可变频率,自然换向的控制器操作,并且作为固定关闭时间模式中的固定关断时间控制器。 该转换器包括四个功能元件。 参考和偏置元件产生用于确定各种信号状态的电压参考和偏置。 定时元件产生固定的关闭时间信号和用于产生双重操作模式的电压斜坡信号。 灾难性事件元件检测导致转换器输出被禁止并重新启动控制器的事件。 模式检测和脉冲宽度调制元件根据来自其他功能元件的信号输入确定转换器的工作模式,并相应地调制输出。 在主要模式中,控制器利用可变频率操作来传送主电源。 在待机模式下,控制器利用固定频率操作提供低功率(小于5W)。